clang is warning that C++20 expects comparison operators to be commutative: `a == b` and `b == a` should resolve to the same comparison operator function. Warnings about the comparison of const and non-const objects can be fixed by making the comparison operator function const.
accessible/base/TextAttrs.h:139:54 [-Wambiguous-reversed-operator] ISO C++20 considers use of overloaded operator '!=' (with operand types 'mozilla::a11y::TextAttrsMgr::TextDecorValue' and 'mozilla::a11y::TextAttrsMgr::TextDecorValue') to be ambiguous despite there being a unique best viable function with non-reversed arguments
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Differential Revision: https://phabricator.services.mozilla.com/D179019
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